Valve-gear.



v T. HALL.

- VALVE GEAR. APPLICATION FILED APR.26,1911.

1,013,549. V Patented Jan. 2,1912.

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COLUMBIA PLANOGRAPH C OuWASHlNUTDN n c T. HALL.

VALVE GEAR. An uoulon FILED APB.26,1911.

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VALVE GEAR.

APPLICATION FILED APR.26,1911.

Patented J an. 2, 1912.

3 SHEETSSHEET 3.

COLUMBIA PLANOGRAPH co., WASHINGTON, D. c.

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' THOMAS HALL, OF RIDGWAY, PENNSYLVANIA, ASSIGNOR T RIDGWAY DYNAMO &

ENGINE COMPANY, OF RIDGWAY, PENNSYLVANIA.

VALVE-GEAR.

Specification of Letters Patent.

Application filed April 26, 1911.

Patented J an. 2,1912.

Serial No. 623,343.

. have the steam-valves positively driven but in such manner as tosimulate the quick opening and closing of the steam-valves of engines ofthe Corliss type.

Attention is directed to United States Patent No. 979002, grantedDecember 20th,

1910, on my application, for improvements in valvegears. In thatconstruction arocker-box is secured to the engine frame between thecrank and the cylinder, rockers in the rocker-box being oscillated byeccentrio-rods and, in turn, transmitting motion by links to the valves.

The present invention aims at the realization of the results of thepatented construc .tion but by different mechanism, and the presentinvention will be readilyunderstood from the following description takenin connection with the accompanying drawings in which a Figure 1 is aside elevation of the cylinder end of a four-valve engine provided withvalve-gear embodying the present invention. Fig. 2 a plan of the same:Fig. 3 a diagram illustrating the motion-work of the valvegear: Fig. 4:a horizontal section of the i rocker-box in the plane of line a of Figs.1

and 8: Figs. 5, 6 and 7 diagrams of the rockers in various positions:Fig. 8 a vertical section of the rocker-box in the plane of line a ofFigs. 1, 2 and azand Fig. 9 a vertical section of rockers in the planeof line I of Figs. 1 and 8.

In the drawings: 1, indicates the cylinder:

2, the stem of the steam-valve at the crank end of the cylinder: 3, thestem of the steam-valve at the head end of the cylinder: 4, a circularrocker-box projecting from the center of the side of the cylinder andopen at its outer face: 5, a removable faceplate closing the outer faceof the rocker-box,

this faceplate carrying three bearings parallel with the valve-stems,one bearing in the lower portion. and two hearings in the upper portionofthe rocker-box: 6, a horizontal joint separating the face-plate intoupper and lower portions, the joint passing through the two upperbearings of the faceplate: 7, a removable lid in the top of therocker-box: 8, rock-shafts journaled in the upper bearings of thefaceplate and having inner ends journaled in bearings in the rear wallof the rocker-box: 9, arms fast on the rock-shafts 8 exterior to therocker-boxz 10, links extending from these arms to the valve-arms on thesteam-valve stems: 11, the arms fast on the steam-valve stems andengaged by the links 10: 12, a rocker-shaft journaled in the lowerbearing of the face plate and having its inner end journaled in abearing in the rear wall of the rocker-box: 13, an arm fast on thislower rock-shaft, exterior to the rocker-box: 14, a rocker pivotallymounted on the engine frame between the cylinder and the crank: 15, arod connected with rocker 14 and adapted to be actuated by an eccentricon the crank-shaft: 16, a link connecting rockers l3 and 141, rocker 14being an expedient for shortening the eccentric-rod and lessening theweight imposed upon rocker 13: 17, the location of the exhaust-valves,with which the present invention does not concern itself: 18, a rockerfast on rock-shaft 12, within the rocker-box, this rocker having twoarms of equal length: 19, a rocker fast on each of rocker-shafts 8,within the rocker-box, the rockers 19 being preferably formed integrallywith their rock-shafts: and 20, links connecting each of the rockers 19with an arm of rocker 18. Lower rocker 18 is bifurcated, as is the casealso with rockers 19, and links 20 engage within these bifurcations. Thefaceplate makes a tight joint with the rocker-box of which it forms apart, and ity is designed that the rocker-box contain a bath of oil forthe lubrication of the moving parts within it, those moving parts beingsubject to violent strains and rapid motions. Lid 7 gives access to theinterior of the rocker-box for purposes of lubrication and inspection.By unbolting the faceplate from the rocker-box all of the rockermechanism pertaining directly to the By unbolting and removing the upperportion only of the faceplate the upper rockers are accessible forinspection, etc.

In the diagrams, Fig. 3 shows the rocker mechanism in mid-position, andsimilarly as to Fig. 6, while Figs. 5 and 7 show the mechanism inopposite extreme positions. The steam-valves, as is well understood, areat certain stages substantially balanced and at other stages unbalanced.An analysis of the diagrams will develop the fact that the valvemovements are extremely rapid; that a given valve has a long dwell inclosed position while the other valve is making its rapid movement; andthat the dwelling of the valves takes place during their unbalancedstage so that the movements of the valves may be imparted to them underthe most favorable conditions as regards balancing. The mechanism issymmetrical and accessible and very compact.

A horizontal engine has been chosen for illustration and the rocker-boxis disposed below the plane of the steam-valves. Where such words asbelow, under and above are employed in the claims it is to be understoodthat they are to be considered merely in their relative sense.

I claim 1. An engine valve-gear comprising, an engine cylinder, anoscillating steam-valve at each end of the cylinder, a main rockshaftmounted on the cylinder below and between the steam-valves, a rocker onthe main rockshaft to serve as means whereby the main rockshaft may beoscillated, a twoarmed main rocker fast on the main rockshaft, asecondary rockshaft disposed between the main rockshaft and each of thesteam-valves, a secondary rocker on each secondary rockshaft, a linkconnecting each of the secondary rockers with an arm of the main rocker,a valve-arm connected with each steam-valve, a valvedriving arm on eachsecondary rockshaft, and a link connecting each valve-drivin armpositively with a valve-arm, combined substantially as set forth.

2. An engine valve-gear comprising, an engine cylinder, an oscillatingsteam-valve at each end of the cylinder, a main rockshaft mounted on thecylinder below and between the steam-valves, a rocker on the mainrockshaft to serve as means whereby the main rockshaft may beoscillated, a twoarmed main rocker fast on the main rockshaft, asecondary rockshaft disposed between the main rockshaft and each of thesteam-valves, a secondary, rocker on each secondary rockshaft, a linkconnecting each of the secondary rockers with an arm of the main rocker,a valve-arm connected with each steam-valve, a valve-driving arm on eachsecondary rockshaft, a link connecting each valve-driving arm with avalve-arm,

and a rocker-box supported by the cylinder and inclosing the main andsecondary rockers and having in its walls bearings for the rockshafts,combined substantially as set forth.

3. An engine valve-gear comprisin an engine cylinder, an oscillatingsteam-valve at each end of the cylinder, a main rockshaft mounted on thecylinder below and between the. steam-valves, a rocker on the mainrockshaft to serve as means whereby the main rockshaft may beoscillated, a twoarmed main rocker fast on the main rockshaft, asecondary rockshaft disposed between the main rockshaft and each of thesteam-valves, a secondary rocker on each secondary rockshaft, a linkconnecting each of the secondary rockers with an arm of the main rocker,a valve-arm connected with each steam-valve, a valve-driving arm on eachsecondary rockshaft, a link connecting each valve-driving arm with avalve-arm, an open-faced rocker-box supported by the cylinder andinclosing the main and secondary rockers and having in its rear wallbearings for the rock-shafts, and a removable faceplate secured to thefront of the rockerbox and havin outer bearings for the rockshafts,combined substantially as set forth.

4. An engine valve-gear comprising, an engine-cylinder, an oscillatingsteam-valve at each end of the cylinder, a main rocka shaft mounted onthe cylinder below and between the steam-valves, a rocker on the mainrockshaft to serve as means whereby the main rockshaft may beoscillated, a twoarmed main rocker fast on the main rockshaft, asecondary rockshaft disposed be tween the main rockshaft and each of thesteam-valves, a secondary rocker on each secondary rock-shaft, a linkconnecting each of the secondary rockers with an arm of the main rocker,a valve-arm connected with each steam-valve, a valve-driving arm on eachsecondary rockshaft, a link connecting each valvedriving arm with avalve-arm, an open-faced rocker-box supported by the cylinder andinclosing the main and secondary rockers and having in its rear wallbearings for the rock-shafts, and. a removable faceplate closing theface of the rockerboX and having outer bearings for the rockshafts, theface-plate being formed in two parts separated in a plane passingthrough the outer bearings of the secondary rockshafts, combinedsubstantially as set forth.

5. The combination of an engine cylinder, valve rock shafts, one neareach end of said cylinder, an arm depending from each shaft,quick-acting valve-operating mechanism adjacent to the cylinder-near thecenter thereof and equidistant from the valve rock shafts, positive linkconnections between said operating mechanism and each of said dependingarms, a rock shaft for the movement of said valve-operating mechanism,of said casing and securing said valve mechan arm on sald shaft, and aconneetlon from anlsm 1n posltlon, a removable upper sectlon 10 said armto a revolving part of the englne for sald caslng, and a removableinspection for moving the arm. cover in said upper section.

' 6. In valve mechanism, the combination THOMAS HALL. of a circularcasing secured to an engine Witnesses:

cylinder, valve-operating mechanism there- O. R. SLADE,

in, a removable face-plate closing one end C. A. FAY.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

